Sin 81° + Tan 81° can be expressed as ………… A) Sin 9° + Tan 9° B) cos 9° + cot 9°

Question

Sin 81° + Tan 81° can be expressed as ………… A) Sin 9° + Tan 9° B) cos 9° + cot 9°

Sin 81° + Tan 81° can be expressed as …………

A) Sin 9° + Tan 9°

B) cos 9° + cot 9°

C) Sin 9° + Cot 9°

D) Cos 9° + Tan 9°

Monjur Alahi

5 views

2025-01-04 04:42

2 Answers

Salim Ahmed Kawsar

Correct option is: B) cos 9° + cot 9°

5 views Answered 2023-02-05 15:29

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct option is: B) cos 9° + cot 9°

sin \(81^\circ\) + tan \(81^\circ\) = sin (\(90^\circ\) - \(9^\circ\)) + tan (\(90^\circ\) - \(9^\circ\))

= cos \(9^\circ\) + cot \(9^\circ\) (\(\because\) sin (\(90^\circ\) - \(\theta\)) = cos \(\theta\) and tan (\(90^\circ\) - \(\theta\))= cot \(\theta\))

5 views Answered 2023-02-05 15:29